But the cut-rate tax is good only through 2008, after which the maximum federal rate on dividends pops back up to 35%.

FORBES: Dividend Kings

But Twitter will probably follow the example of other technology companies, basing its corporate headquarters in Dublin to take advantage of the tax rate (then hiring back-office staff) and setting up another branch in London where it can tap into a wider pool of folks who are highly skilled in software development.

FORBES: Why Twitter Will Pick The Irish

Without that extension, in 2009, the top tax on long-term capital gains will go back up to 20%, while the top rate on dividends will jump to 35%.

FORBES: Congress Fiddles